tf_spell_pickup crash?

Hi, this is probably kind of a vague issue, but whenever I try to put a 'tf_spell_pickup' entity into my map Hammer crashes instantly. Additionally I tried loading up the decompiled version of plr_hightower_event and it crashes instantly as well, I presume because of the 'tf_spell_pickup' entities within the map. Does anyone have any idea what the problem might be? Any help is greatly appreciated.